in germany they sell the tpc 1:500000 pilot charts for the whole northern part of africa (inc. all of the sahara) for 99 € on DVD/CD. of course, these maps are not to be compared with the magnificient ign, but nevertheless they are useful for orientation and trip planning.
have you ever seen the satellite pictures sold by touratech (ca. 50 €)? to me, these pictures (resolution up to 1:250000) in combination with software like quo-vadis are the most useful desert maps of all! with a little expierience, you will be able to make yourself a very good picture of the landscape with interpretation of colors and relief. i used printouts (with a gps-grid) as the only maps in morocco, with much "success" and joy.
good luck
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